Malicious PDF — malware analysis report

Static analysis result for SHA-256 a056d6db94be1587…

MALICIOUS

PDF

94.6 KB Created: 2021-06-27 15:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57f6d09abeef8e94ab68f8111ac10bf4 SHA-1: 20409ab12425964f3c259744e127e1a934f1bbec SHA-256: a056d6db94be15879455c3e2055bdeb68eb70dc4f532f0d7f33185f2ec78eab1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages, serving as a lure for users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=lord+of+the+flies+chapter+2+and+3+summary
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ed51bd874d61e0d6d3f12633686c9727/41859782575.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606de3e362999---44707322363.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/30383486ce4b7380ced3ac5841bfd33f/40379586878.pdf
    • http://handsonmontessoripk.com/userfiles/files/xedixozepiteton.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44d37e543---70037787384.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/998a9865fc4f3057d26cb4c329486f8a/15775121638.pdf
    • https://toptenstudy.com/upload/files/BodyFile__60B982346D072.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/gatiriwoxipowogabaji.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/918229473732c42435d21bfddcc138af/jifili.pdf
    • http://king-ber.com/UploadFiles/file/20210625125020569.pdf
    • http://clubselectionvoyages.com/images/file/24788182957.pdf
    • http://smartvoicecom.com/userfiles/14922637422.pdf
    • http://trunglam.vn/uploads/userfiles/file/dijakanugiwufopasunizepa.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071b18ea1897---rizaxifosozu.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/67092038226.pdf
    • http://vogiantinhmach.com/media/ftp/file/xafekusadulazekoxininuk.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b619cc0299---jupumudibufeguxofexuke.pdf
    • http://www.asslar.de/downloads/bonerawafuzoxewibedu.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d8f183102---juxogal.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3467e9e520---98928113980.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c498f0a54de---2337408586.pdf
    • https://sunrise-photon.com/upfiles/editor/files/40427174546.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6c28c6697---8878011300.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/wepebifileb.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bb4.bin
8668de26e6044ed4d84dd91429030247becd7f8a7eb04551878d21b1375c6b63
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 11348 bytes
font_01_sfnt_off00012651.bin
f909bf6022730e9b17755ab0bbc4bb2191132d1a9804005f758d76380c577754
pdf-font-stream PDF embedded font (sfnt) at offset 0x12651 17860 bytes
font_02_sfnt_off00015526.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15526 16792 bytes